Method of developing electrostatic latent image
AssigneeHitachi Metals, Ltd.
InventorsMasumi Asanae, Masahisa Ochiai
Life of this patent
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Abstract
A method of developing an electrostatic latent image on a rotating image-bearing member with a magnetic developer in which a developing roll consist of only a permanent magnet member and the peripheral speed of the developing roll is regulated to be nearly equal to the moving speed of an image-bearing member. With such a construction, an electrophotographic recording apparatus can be miniaturized while producing an image of high quality.
Claims6
A method of developing an electrostatic latent image on a rotating image-bearing member with a magnetic developer, wherein
- a magnetic developer containing an electrical insulating toner is attracted on a surface of a sleeveless developer-transporting roll and transported to a developing zone by the rotation of the sleeveless developer-transporting roll, the sleeveless developer-transporting roll consisting of an integrally molded cylindrical permanent magnet member having a plurality of magnetic poles on the surface thereof;
- and
- the magnetic developer is brought into contact with the surface of the image-beating member to develop the electrostatic latent image while keeping the relationship between the peripheral speed Vm of the sleeveless developer-transporting roll and the moving speed Vp of the image-beating member within the range whereby 0.8.ltoreq.Vm/Vp<1.2.
A method of developing an electrostatic latent image on a rotating image-bearing member with a magnetic developer, wherein
- a magnetic developer containing an electrical insulating toner is attracted on a surface of a sleeveless developer-transporting roll and transported to a developing zone by the rotation of the sleeveless developer-transporting roll, the sleeveless developer-transporting roll consisting essentially of an elastically deformable cylindrical permanent magnetic member integrally molded from a material comprising a magnetic powder, an electrically conductive filler and a binder resin, and a specific volume resistance of the permanent magnetic member being 10.sup.7 .OMEGA..cm or less;
- and
- the electrostatic latent image is developed by contacting the permanent magnetic member with the surface of the image-bearing member through the magnetic developer layer while keeping the peripheral speed Vm of the sleeveless developer-transporting roll nearly equal to the moving speed Vp of the image-beating member to satisfy the equation:
- 0.8.ltoreq.Vm/Vp.ltoreq.1.2.
Dependencies are inferred from the claim text.